dji ZENMUSE L2 User Manual

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2.3. Key Terms
2.3.1. Detection Range
The farthest measurable distance of the LiDAR module. This parameter is greatly affected by the
actual environmental conditions. The main influencing factors include the target object's surface
reflectivity and shape and ambient light interference. In most cases, measurable distances under
different lighting and reflectivity conditions are provided on LiDAR by manufacturers.
In the case of DJI Zenmuse L2, its LiDAR supports a detection range of 450 m under 0 klx when
the target object's reflectivity is 50%, and 250 m under 100 klx when the target object's reflectivity
is 10%.
"450 m @50% reflectivity, 0 klx" means that when the solar illuminance is 0 klx and the target
object's reflectivity is greater than 50% (the reflectivity of a concrete floor or a road surface is 15%
to 30% and the reflectivity of a white plaster wall is 90% to 99%), the maximum measurable distance
is 450 m.
"250m @10% reflectivity, 100 klx" means that when the solar illuminance is 100 klx and the target
object's reflectivity is greater than 10% (the reflectivity of a concrete floor or a road surface is 15%
to 30% and the reflectivity of a white plaster wall is 90% to 99%), the maximum measurable distance
is 250 m.
Most LiDAR sensors in the market use diffuse reflective objects (with reflectivity at 90%) as the
testing benchmark. However, this parameter has limited practical significance. The measurable
distance at a reflectivity of 10% has practical significance instead.
2.3.2. Multiple Returns
LiDAR can receive multiple returns. This characteristic can be used to detect the edges of objects.
DJI Zenmuse L2 provides the multiple-return mode, with five returns supported at most. Among the
multiple returns, the first return acquires information about the height of the measured object, the
intermediate returns usually correspond to the structure of the object, and the last return corresponds
to the bare ground. In densely vegetated areas, the multiple return mode can obtain information such
as the number of trees, crown width, and height of trees. For example, in sparsely vegetated areas
for which lightweight data is required, the triple return mode can be enabled. In densely vegetated
areas, the penta return mode is more appropriate for stronger penetrability.

dji ZENMUSE L2 Specifications

General

Brand	dji
Model	ZENMUSE L2
Category	Drone & Quadcopter Accessories
Language	English